Relief mechanism for pumps



April 10, 1928. 1,665,382

- L. P. STOREY RELIEF MECHANISM FOR PUMPS Filed April 24, 1926 Jwuentom This invention relates to relief mechanism: a pump 6, shown diagrammaticallyinliig. 55

adapted to operate automatically to by-pass r Patented Apr. 10, 1928.

'LEONIIDAS r. STOREY, or ST. PAUL, MINNESOTA, nssrenon or ONE-HALF TO WATEROUS 7 FIRE ENGINE womzs, A oonronarron or MINNESOTA.

RELIEF MECHANISM FOR I-U'MIP S.

Application filed pnea, 192 Serial in). 194,315.

fluid from the-delivery to'the intakeconduit of a pump when the pressure in thedelivery conduit is increased beyond a predetermined degree. e i

One important use of my inventioniis upon a high pressurepump of the typeu'sed in fire extinguishing apparatus In such apparatus, a water control valve is com m'only placed near the nozzle or delivery end of the hose, andvis usedt'o shut off the'water at thewill ofthe hose operator. The en 7 the nozzle control valve; 1 Therefore, to

deflection onlyin proportion to the load is gine and pump are usually located atsuch a distance from the delivery nozzle that fthe pump cannot be shut oif simultaneously-with avoid excessive pressure in the hose when the nozzle valve "is closed, it is important to supplyrelief mechanism ada'ptedto operate automatically by the increased pressure caused when the flow in the hose is stopped; It is the object of this invention to provide novel" and "efficient mechanism for atfording relief of this kind.

More particularly, it is my object to" provide a spring actuated relief valve in which the normaltendency of the spring to permit compensated for in such a manner that the maximum deflection and valve'ope'ning' is effected upon theflapplication of a predetermined pressure. l I

A further object is-to provide a relief valvewhich operates toby-pass fluid from the delivery 'tolthe intake conduit of a pump, independently of the pressure in the intake conduit.

[This inventionfalsoincludes certain other novel features of, construction which will be [more fully, pointed out in' the following f duitsof a pump, said: pump being shown-kli specification and claims.

I The invention will'be referenoeto'the accompanying drawlngs, 1n

which Figure'1 is acentral, verticalsection through; my improved valve; lifig, 2 is an "end view'of the valve, mounted upon 'afby "pass between the delivery and intake conagrammatically and Fig. 3 i's a sectionftaken on"the"line$' 3 ofFig.2.; I

"Asshown in the drawings,"my relief valve has an opening 4,-adapted to belplaced in' communication with a delivery conduit 510i best understood by r 2. Another opening 7 in the valve is adapt ed to communicate through a by-pass 8'with the intake or suction conduit 9 leading "to' the pump '6." Disposed opposite the opening 4, isia piston 10, having a close machinefit inbearings 11 and 12. An internal-passage way 13 in the piston 10 isarranged to transinitfluid pressure applied through the opening 7 upon heads 14 and 15 formed in the piston. 5A p'assageway'lfi, communicating' withthe opening 14 is adapted to transmit j j fluiclfrom said openingto an openingarou-n'd the head 15 andinto the chamber 13 in the piston when in open position. Thus, as will piston 1O 'has a jskirt 17, adapted to guide the same in the body. of the valve, and form ing a chamber to receivea toggle finger 18.

The' va'lve is adapted to be normally held the upper endof which is connected'by a pin 19'with a crank 20.' This crank 20 is ,in closed position by the toggle finger 18,

pivoted'at one side ofthe axis of the piston 10 upon a pin 2l'and carries an anti-friction roller 22 in contact with a washer 23, adapted to be pressed downward by a coiled spring 2st. The spring 24 bears at itsupper Jend upon a member 25 having an axial bore threaded to receive a screw 26. This screw a bonnet 27 -encasing the spring and is prois freely revoluble in a suitable bearing in against turning with thescrevv, fingers 29 are formed on the periphery of'said member and engage suitable slots in oppositefsides of the bonnet, A'series of lugs 30 extend longitudinally in the bonnet 27 at suitable spaced intervals around its periphery to engage and centerthespring2t in saidbonnet. LThe lower extremity'of the finger 18 fits in the rounded apex of a conical recess 32 I the piston 10.

"11 1 6, th spring 2 l'nornially operates to maintain the roller 22,pinf19 and toggle fin lger- 18 in alignment, as shown infull'lin'es inFig'. g1, and therebyretai-n the piston 10 i 'inclosed position Thepressure exerted by a predetermined point. 7 te'riiiin-e'd pressureis applied in the openingthe spring 24: is adjusted'by means of the wheel '28 to permit opening of the valve When the pressure in the conduit reaches When this prede- 4,.the spring 24: will act likeadead" weight byi'eason of my peculiar form ofconnecting link between the pisto-If and spring Thus, 'asthe piston begins to move, it actuates the finger 18 to pivot the crank 20 upon I the pin 21 so that the lower extremity of the crank 20 carries the pin 19 tonne 'side of the axis of the piston 10 This shortens thelink between piston and spring and in creasesthe leverage exerted by the piston on f the spring; -The increased leverage is suflifao c trte o s t the i en y of the sp ngs.

be' defiectfed in proportion to; theload, and

thetoggle finger 18 and crankQLQ inmoving to the dottedline position shown in Fig. 1 permit, maximum opening of the valve.

Fluid from the opening 4 is allowed to es: cape to'the opening 7varoundjthefperiphery of the heads 14 and" 15 Central "webs 3 are fOIIIlBCl'lII the pistonto connect the head Mftoi the he ad 15"and the valve is formed with an annular space connecting the several partsfof; the chamber 13. To. limit from a lower levehsuch as a lake or other reservoir, a hose 35 .is connectedwiththe intake conduit 9, and the valve 34: is closed while the pump 6'is operated to replace the air in the intake conduit with Water. Upon further operation of the pump, the valve 34 i so maybe opened to bring therelief. valve intoioperation," The pumps in common use also-havea manually operable valve 36, lo:

cated in} the delivery conduit 5, adjacent to the outlet to which the hose 37 is connected. Thisvalve 36 may be closed and the pump 6 operated until the water or other fluidis requiredfin the hose-37. During the time; the valve 36 is closed, the fluid is pumped from the ;inta ke condui t 9 into the delivery con duit 5 and the relief valve operates to allow ;fiow of Water through the by-pass 8, thus, returning it to the intake side of thepump. As soon as the pressure is reduced, as by opening the valve? 36, the spring 24 operates to close'the relief valve and thus deliver the -fluid to the hose 37,

As will now be..read ily;understood, the

; operation of the piston 10 in the reliefvalve is, independent of the pressure in the opening- 7 leading to the intake 'con'duit, and the pis ton operates to open the relief valve? under a predetermined pressure in the "delivery I conduit irrespective of whether there is a vacuum; or" a pressure'in the'intake opening 7. Further, the piston 10 opens the valve quickly as soon as the predetermined pres- ,surehas been reached, and the extent of opening of the valve is not proportional to the load applied to the piston. The extent of openingor the relief valve is dependent upon the v olu me of fluid to be passed and the piston may open-nightl or to its fullest extent With practically no increase in pressure. This feature results in sensitive, quick operation. Itwill furtherbe notedthatithe valve 7 is self contained simple and durable, and as there are no stuffing boxes; the friction of the parts is constant. a Ha ng d ri ed my nven n W at I claimas new and desire to protect icy/ Letters Patentis: My M I v- Th a ati n nrvrel mecha ism P mp, of a flu dd l e y n. j t,;ar: lief valve having inlet and outletopenings,

said inlet opening communicating withthe i delivery conduit of said pump, a closureiy said valve, a spring arranged to normally maintain said closure in closed pos t1on; and

adapted to permit opening of said valve d l ry c t, a e er and;.at. g1s fi piv a v io e iendit en nd m: terposed between said spring and closure' to tran m o e e ;o i aidvcl sure toskiid g, and a ral yrroi cf ns P t v of said lever having a pivotalsupport in the -valve,'said spring beinglarra nged to nor mally 1 maintain .said finger in alignment with a portion of said lever and said lever and finger being arrangedv to be thrown out 'of'alingment one with the othjer to thereby increase the leverage 'of said closure on-said spring whencsaid spring is deflected, 2. Ina relief meohanism for a'pump having a fluid deliveryconduit, the combination with a relief valve-having an intake opening communicating with said delivery conduit, a piston elosure in sa d valve,- a coiled spring.

arranged in axial a'lingninent with piston and adapted to normally maintain the same in closed po'sitionand toggle members f i normally held in axial alignment with said spring and piston for transmitting move ment' of saidpiston' tosaid spring whereby 1 e quick opening ofthe piston to maXimum ektent is permitted when a predetermined pres- 1 c sure is applied in said-delivery conduit; a 3.111 a relief mechanismffor apump havwhen apredeterminedrpressure is applied in its ing fluid delivery and intake conduits, the

combinati on with-a relief valve having an intake opening communicating with said: de-

livery conduit andianoutlet-opening communicating With said intake conduit; a piston in closed position, a chamber formed in said closurein saidgvalve,-fa coiled; spring ar-' v V rangedi n axial alignment withsaid piston and adapted tonorinallygmaintainthesame I t piston in communication with saidoutlet piston to maximumiextent is permitted Opening and arranged to balance fluid pres-V When'a predetermined pressure is applied in 7 sure from said opening upon the piston, and said delivery conduit. r toggle members normally held in axial In testimonywhereof, I have hereunto 5 alignment With said spring and piston for signed my name'to this specification.

transmitting movement of said piston to e aid spring whereby quick opening of the LEONIDAS 

